Should I re-read theory and errors or just go straight to practice?

I am interested in a subject that is only tested on exercises, however it has also a lengthy theory. I have gone through the theory and I have made notes on parts I wasn't aware of at first. I have also gone through the introductory exercises by myself and I have made notes on points I wasn't aware of at first. The length of that 'book' is quite, about 50 pages of convoluted notes and subnotes that may expand to other material or between one another.

The question is, is it of great value to go through those notes or go through new exercises only? Or should I combine it somehow?

I wouldn't assume I know every subject. This is academic guidance, not of a specific subject.

Anyway, thanks for making it clear you are more interested in being sarcastic. Bye.

You're being incredibly vague as is. Are you looking for study tips or just trying to cause a hard time?

It would help if you could be more specific about what you need help with ( maybe even include the topic you happen to be studying for ). Then perhaps you can receive a well structured response from somebody.